The from the Warlock's Tomb

DON'T LIGHT THE LAMP!

Anthony Monday can't understand why his best friend Miss Eells, the town librarian, is so excited about an old Dutch oil lamp, but she buys it anyway. Little do they know that the lamp was stolen from an underground tomb--a frightening tomb where eerie occult rituals used to be held. When Anthony borrows the lamp for a school science project, he makes a very big mistake: he lights it. Monstrous forces are at once unleashed, forces so demonically powerful that they threaten to take over the entire world--unless Anthony and Miss Eells can stop them! (from backcover of Bantam-Skylark edition, 1989)